With enough energy you certainly could, even if that meant breaking everything down to their constituent parts chemically and doing stuff like reconstructing proteins from amino acids. This isn’t reversing entropy but you could back the original ingredients, with some Ship of Theseus stuff happening with the matter involved.
Not really, no - entropy is one-way at the macro scale.
The flour absorbed water, and combined with kneading, produced gluten (and was baked, causing more chemical changes).
Grinding it all up wouldn’t reverse that process - it would just be ground up bread.
With enough energy you certainly could, even if that meant breaking everything down to their constituent parts chemically and doing stuff like reconstructing proteins from amino acids. This isn’t reversing entropy but you could back the original ingredients, with some Ship of Theseus stuff happening with the matter involved.
Breadcrumbs. Panko if fortunate.
Or croutons.